It can be anything! An apex, subdomain, or even a URL.
Domain Name: www.test.spo.msDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-20T11:54:11.011Z <<<
Domain Name: www.test.spo.ms
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-20T11:54:11.011Z <<<